source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH24h_HSetBlocks.asm@ 218

Last change on this file since 218 was 218, checked in by aitotat@…, 13 years ago

Changes to XTIDE Universal BIOS:

  • Number of sectors to transfer is now limited to 1-128 for old INT 13h functions.
File size: 2.0 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=24h, Set Multiple Blocks.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h function AH=24h, Set Multiple Blocks.
9;
10; AH24h_HandlerForSetMultipleBlocks
11; Parameters:
12; AL: Same as in INTPACK
13; DL: Translated Drive number
14; DS:DI: Ptr to DPT (in RAMVARS segment)
15; SS:BP: Ptr to IDEPACK
16; Parameters on INTPACK:
17; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128)
18; Returns with INTPACK:
19; AH: Int 13h return status
20; CF: 0 if succesfull, 1 if error
21;--------------------------------------------------------------------
22ALIGN JUMP_ALIGN
23AH24h_HandlerForSetMultipleBlocks:
24 test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
25 jnz SHORT .TryToSetBlockMode
26 stc
27 mov ah, RET_HD_INVALID
28 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
29
30ALIGN JUMP_ALIGN
31.TryToSetBlockMode:
32%ifndef USE_186
33 call AH24h_SetBlockSize
34 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
35%else
36 push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
37 ; Fall to AH24h_SetBlockSize
38%endif
39
40
41;--------------------------------------------------------------------
42; AH24h_SetBlockSize
43; Parameters:
44; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128)
45; DS:DI: Ptr to DPT (in RAMVARS segment)
46; SS:BP: Ptr to IDEPACK
47; Returns:
48; AH: Int 13h return status
49; CF: 0 if succesfull, 1 if error
50; Corrupts registers:
51; AL, BX, CX, DX
52;--------------------------------------------------------------------
53;ALIGN JUMP_ALIGN
54AH24h_SetBlockSize:
55 push ax
56 xchg dx, ax ; DL = Block size (Sector Count Register)
57 mov al, COMMAND_SET_MULTIPLE_MODE
58 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRDY, FLG_STATUS_DRDY)
59 call Idepack_StoreNonExtParametersAndIssueCommandFromAL
60 pop bx
61 jnc .StoreBlockSize
62 mov bl, 1 ; Disable block mode
63.StoreBlockSize: ; Store new block size to DPT and return
64 mov [di+DPT_ATA.bSetBlock], bl
65 ret
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